<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>4_加加减减</title>
</head>
<body>
    <div id="app">
        <li v-for="(item, index) in numbers" :key="index">
            {{ item }} 
            <button @click="del(index)">删除</button>
        </li>
        <button @click="add">生成</button>
    </div>
    <script src="./vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                numbers: [] 
            },
            methods: {
                del(index) {
                    this.numbers.splice(index, 1)
                },
                add() {
                    this.numbers.push(Math.floor((Math.random() * 20)))
                }
            }
        })
    </script>
</body>
</html>